The document discusses the functions and characteristics of muscles in the human body. It notes that muscles make up 40% of total body weight and describes some key facts about specific muscles, such as the heart being the hardest working muscle and the gluteus maximus being the largest muscle. It then outlines 11 main functions of the muscular system, including mobility, stability, posture, circulation, respiration, digestion, urination, childbirth, vision, organ protection, and temperature regulation.

1. PREPARED BY
SENTHILKUMAR THIYAGARAJAN

2.  Why we need muscles ….
 What is the muscle

3.  Is it really enough to know their origin & ins &
action

5.  No no no
 we should know everything about muscle

6.  Muscles make up approximately 40
percent of total weight.
 The heart is the hardest-working
muscle in the body. It pumps 5
quarts of blood per minute and 2,000
gallons daily.
 The gluteus maximus is the body's
largest muscle. It is in the buttocks
and helps humans maintain an upright
posture.

7.  The ear contains the smallest muscles in
the body alongside the smallest bones.
These muscles hold the inner ear together
and are connected to the eardrum.
 A muscle called the masseter in the jaw is
the strongest muscle by weight. It allows
the teeth to close with a force of up to 55
pounds on the incisors or 200 pounds on
the molars.

8.  The muscular system contains more than
600 muscles that work together to enable the
full functioning of the body.

9.  1. Mobility
 The muscular system's main function is to allow
movement. When muscles contract, they
contribute to gross and fine movement.

10.  2. Stability
 Muscle tendons stretch over joints and
contribute to joint stability. Muscle tendons
in the knee joint and the shoulder joint are
crucial in stabilization.
 The core muscles are those in the abdomen,
back, and pelvis, and they also stabilize the
body and assist in tasks, such as lifting
weights.

12.  3. Posture
 Skeletal muscles help keep the body in the
correct position when someone is sitting or
standing. This is known as posture.

13.  4. Circulation
 The heart is a muscle that pumps blood throughout
the body. The movement of the heart is outside of
conscious control, and it contracts automatically
when stimulated by electrical signals.
 Smooth muscle in the arteries and veins plays a
further role in the circulation of blood around the
body. These muscles maintain blood pressure and
circulation in the event of blood loss or dehydration.

14.  5. Respiration
 Breathing involves the use of the diaphragm
muscle.
 When someone wants to breath more deeply,
it requires help from other muscles, including
those in the abdomen, back, and neck.

16.  6. Digestion
 Smooth muscles in the gastrointestinal or GI
tract control digestion. The GI tract stretches
from the mouth to the anus.
 Food moves through the digestive system
with a wave-like motion called peristalsis.
Muscles in the walls of the hollow organs
contract and relax to cause this movement,
which pushes food through the esophagus
into the stomach.

17.  7. Urination
 bladder
 kidneys
 penis or vagina
 prostate
 ureters
 urethra

18.  8. Childbirth
 Smooth muscles in the uterus expand and
contract during childbirth. These movements
push the baby through the vagina. Also, the
pelvic floor muscles help to guide the baby's
head down the birth canal.

19.  9. Vision
 Six skeletal muscles around the eye control
its movements.
 These muscles work quickly and precisely,
and allow the eye to:
 maintain a stable image
 scan the surrounding area
 track moving objects

20.  10. Organ protection
 Muscles in the torso protect the internal
organs at the front, sides, and back of the
body. The bones of the spine and the ribs
provide further protection.
 Muscles also protect the bones and organs by
absorbing shock and reducing friction in the
joints.

21.  11. Temperature regulation
 Maintaining normal body temperature is an
important function of the muscular system.
Almost 85 percent of the heat a person
generates in their body comes from
contracting muscles.

22.  Mobility
 Stability
 Posture
 Circulation
 Respiration
 Digestion
 Urination
 Childbirth
• vision
•Childbirth
•Organ
protection